Hexadecyltrimethylammonium hydroxide promotes electrocatalytic activity for the oxygen evolution reaction

• Published in: Communications chemistry Vol. 3; no. 1; p. 154
• Main Authors: Gao, Yugan, Wu, Chengqi, Yang, Sen, Tan, Yiwei
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 04.11.2020; Nature Publishing Group
• Subjects: 639/638/161/886; 639/638/675; 639/638/77/887; Ammonia; Boranes; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Conditioning; Electrocatalysts; Electrolytes; Electrolytic cells; Energy technology; Fuel cells; Oxygen evolution reactions; Renewable energy; Renewable resources; Surface area; Water splitting
• ISSN: 2399-3669; 2399-3669
• DOI: 10.1038/s42004-020-00406-w

The oxygen evolution reaction is an essential factor in many renewable energy technologies, such as water splitting, fuel cells, and metal–air batteries. Here we show a unique solution to improve the oxygen evolution reaction rate by adjusting the electrolyte composition via the introduction of hexadecyltrimethylammonium hydroxide into an alkaline electrolyte. The strong adsorption of hexadecyltrimethylammonium cations on the surface of electrocatalysts provides the increased absolute number of OH − ions near the electrocatalyst surface, which effectively promotes the oxygen evolution reaction performance of electrocatalysts, such as Fe 1− y Ni y S 2 @Fe 1− x Ni x OOH microplatelets and SrBaNi 2 Fe 12 O 22 powders. Meanwhile, we present an electrochemical conditioning approach to engineering the electrochemically active surface area of electrocatalysts, by which the resultant Fe 1− y Ni y S 2 @Fe 1− x Ni x OOH microplatelets have a larger electrochemically active surface area after the electrochemical conditioning of the as-synthesized Fe 1− y Ni y S 2 microplatelets using ammonia borane than those obtained after the conventional electrochemical conditioning without ammonia borane, presumably due to the appropriate conversion rate of Fe 1− x Ni x OOH shells. Methods to overcome the slow kinetics of the oxygen evolution reaction are desirable for a range of renewable energy technologies. Here the authors demonstrate that the rate of oxygen evolution is enhanced upon introduction of hexadecyltrimethylammonium hydroxide into the alkaline electrolyte.